Home / 28,971.72-39,981.54-18,906.60

Finding the Fourth Proportional to 28,971.72, 39,981.54 and 18,906.60

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Solution

The fourth proportional to 28,971.72, 39,981.54 and 18,906.60 is: 26,091.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,971.72 : 39,981.54 = 18,906.60 : x
  2. Step 2: Convert to fraction form
    28,971.72/39,981.54 = 18,906.60/x
  3. Step 3: Cross multiply
    28,971.72x = 39,981.54 × 18,906.60
  4. Step 4: Simplify right side
    28,971.72x = 755,914,984.16
  5. Step 5: Solve for x
    x = 755,914,984.16/28,971.72
  6. Step 6: Final answer
    x = 26,091.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.